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Related Experiment Videos

Testing congruence in phylogenomic analysis.

Jessica W Leigh1, Edward Susko, Manuela Baumgartner

  • 1Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, Canada.

Systematic Biology
|February 22, 2008
PubMed
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Concaterpillar, a new method, identifies reliable gene sets for phylogenomic analysis. This improves understanding of the eukaryotic tree of life and reveals evolutionary events like gene transfer.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Bioinformatics

Background:

  • Phylogenomic analyses using large gene sets can revolutionize understanding of the tree of life.
  • Individual gene phylogenies often conflict due to varying evolutionary histories, biases, or errors.

Purpose of the Study:

  • To develop a method for identifying congruent gene sets for robust phylogenomic analysis.
  • To assess the impact of congruent gene set selection on eukaryotic phylogeny reconstruction.

Main Methods:

  • Developed Concaterpillar, a hierarchical clustering method using likelihood-ratio testing.
  • Incorporated a test for shared relative evolutionary rates to guide concatenation strategies.
  • Applied multiple comparison correction for improved method performance.

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Main Results:

  • Identified three congruent protein subsets from a 60-sequence eukaryotic phylogenomic data set.
  • Analysis of the largest subset yielded a more congruent phylogeny with stronger support for five eukaryote supergroups.
  • A second subset suggested a close relationship between stramenopiles and red algae, indicating potential gene transfer.

Conclusions:

  • Concaterpillar effectively identifies congruent loci, enhancing phylogenetic accuracy.
  • The method aids in resolving evolutionary relationships and understanding genome evolution, including horizontal gene transfer events.